Dating Tasks By Email

I_m a heavy user of adding tasks per email. But entering a specific date is a bit cumbersome. Say I want a task to begin on November, 30 I add ">2011-11-30". It would be more convenient to have a shorter phrase like ">30", meaning the next day being the 30th of a month. ">Sep" may stand for the first day in September.That would be much shorter, less error prone, and perfectly in line with phrases like ">tue", meaning next Tuesday.